This plugin file could not exist multi versions in \Oracle\Policy Modeling directory.
For example if other version exist in this directory OPM project file not start excel or word file with double click.
It shows error message.

Unless Word reports some technical limitation when changing the associated template, OPM should be able to convert a Word document from the version it was created with to the version on the current machine.

Any project created in the same "minor" version of OPM will work interchangably. So a project in 10.4.0 will open in 10.4.1 or 10.4.2, and a project in 10.4.2 will open in 10.4.1 or 10.4.0. For the same major version, you can upgrade a project to a later minor version but not downgrade. So a 10.2 project will upgrade when opened in 10.4, but it is then no longer able to be opened in 10.2 (a backup is created prior to upgrade)